随机车流作用下多塔斜拉桥总体荷载响应特性

发布时间：2018-05-13 21:16

本文选题：多塔斜拉桥 + 汽车荷载响应　；参考：《同济大学学报(自然科学版)》2014年01期

【摘要】：结合车辆荷载研究技术,以三塔斜拉桥为例,分析了该结构在随机车流作用下的总体荷载响应特性,深入研究了实际汽车荷载响应与规范荷载模型计算值差别,探讨了车流随机特性参数对结构响应特性影响.结果表明:我国《公路桥涵设计通用规范》(JTG D60—2004)的汽车荷载模型对多塔斜拉桥估计过高,交通运营状态和日均交通量、重车混入率交通特性等参数对汽车荷载响应影响显著,对不平衡加载敏感不同的效应显示出对随机车流不同的响应特性.说明现有规范基于影响面确定加载范围的极端加载方式及荷载取值无法反映多塔斜拉桥的实际汽车荷载响应状况,建立反映实际状况的荷载模型可考虑引入多参数多级别的性能设计思想.
[Abstract]:Combined with vehicle load research technology, taking three-tower cable-stayed bridge as an example, the overall load response characteristics of the structure under the action of random traffic flow are analyzed, and the difference between the actual vehicle load response and the calculated value of the code load model is deeply studied. The influence of the random characteristic parameters of the vehicle flow on the response characteristics of the structure is discussed. The results show that the vehicle load model of JTG D60-2004) has a significant effect on vehicle load response, such as the overestimation of multi-tower cable-stayed bridge, the traffic operation state and daily average traffic volume, the traffic characteristics of heavy vehicle mixing rate, and so on. Different effects sensitive to unbalanced loading show different response characteristics to random traffic flow. It shows that the extreme loading mode and load value of the existing code based on the influence surface can not reflect the actual vehicle load response of multi-tower cable-stayed bridge. The multi-parameter and multi-level performance design idea can be taken into account in the load model which reflects the actual situation.
【作者单位】：同济大学土木工程学院;
【基金】：国家自然科学基金(51108338)
【分类号】：U448.27;U441.2

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